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General (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Oct. 31, 2017
May 31, 2016
May 19, 2016
Dec. 31, 2017
Dec. 31, 2016
General (Textual)          
Follow-on public offering   $ 50,000      
Follow-on public offering per sahre price $ 19.50 $ 11.00      
Sale of ordinary shares     1,818,182 5,189 5,189
Total consideration of shares   $ 21,279   $ 30,206 $ 21,279
Other offering expenses $ 2,194 $ 1,721 $ 1,455    
Ordinary shares issued   2,090,909      
AT&T Engagement [Member]          
General (Textual)          
Pursuant to AT&T Engagement       $ 24,528 $ 18,310
Percentage of consolidated revenues       66.00% 62.00%